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ToolPlain/10 trustVerified
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Plain

API-first B2B support platform with an AI agent built into every layer.

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About

Plain is a support platform built for B2B software companies, pulling Slack, Microsoft Teams, Discord, email, chat and a help center into one queue. Its AI agent Ari answers from the knowledge base and follows configured workflows, while Sidekick drafts replies for a human to review and send. Customers named in coverage include Vercel, Cursor, n8n, Raycast and Sourcegraph.

Pricing is per seat — Foundation at $35/month for one seat, Horizon at $299/month for three seats, Frontier custom — so costs climb quickly past the seat caps, and the AI credit overage rate isn't published.

What it can do

  • Unified multi-channel inbox
  • Ari AI agent for autonomous answers
  • Sidekick agent-side drafting assistant
  • Plain Insights conversation analytics
  • GraphQL API for programmatic access
  • Linear and Jira sync

Setup

  1. Sign up at plain.com and create your workspace.
  2. Connect your channels: Slack, Teams, Discord, email and chat.
  3. Import your help center docs into the knowledge base.
  4. Configure Ari's workflows and escalation rules.
  5. Invite agents and go live.

Prerequisites

A B2B support operation; admin access to the channels you want to connect.

Use cases

agentsautomationdata

Works with

Generic API

Trust score — 7/10

/10 trustVerified

Scored 7/10 (verified tier, metrics-v1). Evidence: Named customers (Vercel, Cursor, n8n, Raycast, Sourcegraph) per company-placed press release — treat as marketing, not independent audit; Pricing verified Sept 2026 via third-party guide, not the official page itself; AI credit overage rate not published — cost risk for heavy AI users. License: Proprietary SaaS..

How the trust score is built

Full methodology →
Adoption · stars/downloads, log-scaled vs peers
8.0/10
Maintenance · recency, releases, issue load
8.0/10
Openness · license + docs
6.0/10
Manual review · sanity read + red-flag check
7.0/10
  • · Named customers (Vercel, Cursor, n8n, Raycast, Sourcegraph) per company-placed press release — treat as marketing, not independent audit
  • · Pricing verified Sept 2026 via third-party guide, not the official page itself
  • · AI credit overage rate not published — cost risk for heavy AI users

Sources

Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.